[hunghingdailo]

I found this on another forum :

here is the link.

Another problem with the tightness of this join between the magazines and the gun is that the nozzle becomes damaged at its back edge due to the loading muzzle cutting into the rubber as it returns forward after a cycle of the slide. My old Marui 1911A1 ‘Eleanor’ has damaged magazine nozzles due to this problem, so it seems this is not a new fault.

And it was mentioned that one of the fix is to file away a part of the magazine where the mag catch will snap to lock the mag once inserted :

we have come up with a possible fix, namely to file away 0.5mm of the top edge of the catch groove located on the magazine itself. This then would lower the magazine in the weapon just enough to allow it room so the loading muzzle does not damage the rubber nozzle in the magazine but still retain a good enough seal so excessive gas is not released.
We feel this ‘fix’ is only to be attempted by those who feel competent to do such work as if you have just spent out your hard earnt cash the last thing you want to do is damage your new purchase.
With regards to this, the damaged nozzles can be replaced cheaply and easily if they start to let by badly.

I haven't experienced the damage yet... And seeing the pictures he posted scares me off that I was tempted to file either the magazine or the magazine catch.

Reading few posts above regarding the return of loading nozzle, it wasn't a flaw. So, I assume the mag lip and the loading nozzle is supposed to wear for the sake of 'normal' operation / better air seal?